A mathematical model relating the flow curve of a cement paste to its water/cement ratio

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Abstract
Synopsis This paper describes an experimental and empirical study of the rheological properties of cement pastes under the action of a steady shear. Experimental results were obtained by using a Weissenberg rheogoniometer for a range of water/cement ratios of ‘fresh’ pastes. Particular reference is made to a mixing method which produces reversible flow curves. Various models are considered as empirical relationships between shear stress and shear rate. It is shown that the Robertson Stiff model provides a very accurate description of the rheology of the cement paste for a range of concentrations. An indication is given of the possibility of predicting flow curves by the use of a proposed empirical equation. Qualitative agreement is obtained between theory and experiment. Synopsis This paper describes an experimental and empirical study of the rheological properties of cement pastes under the action of a steady shear. Experimental results were obtained by using a Weissenberg rheogoniometer for a range of water/cement ratios of ‘fresh’ pastes. Particular reference is made to a mixing method which produces reversible flow curves. Various models are considered as empirical relationships between shear stress and shear rate. It is shown that the Robertson Stiff model provides a very accurate description of the rheology of the cement paste for a range of concentrations. An indication is given of the possibility of predicting flow curves by the use of a proposed empirical equation. Qualitative agreement is obtained between theory and experiment.

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